CdS Quantum Dots Sensitized TiO2 Nanotubes Photocatalytic Degradation of Dimethyl Phthalate under Sunlight Irradiation

The CdS quantum dots sensitized TiO2 nanotubes were prepared by sequential chemical bath deposition (S-CBD) method and characterized by FE-SEM and UV-vis spectroscopy. And they were used to degrade the dimethyl phthalate (DMP) in aqueous under sunlight irradiation. The results show that these photo-catalysts have the highest performance, while the initial concentration of dimethyl phthalate in aqueous solution is 10 mg / L, the degradation rates reaches above 80% in the optimum condition which is the CdS deposited 20 cycles, catalyst dosage ~3cm2, and the sunlight irradiating 180 minutes.

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Compound WO3/TiO2 Nanorods Photocatalytic Degradation of Dimethyl Phthalate in Visible Light Region

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.2996 ◽

2012 ◽

Vol 518-523 ◽

pp. 2996-2999

Author(s):

Chang Qing Wang ◽

Su Juan Pan ◽

Guo Fang Zuo ◽

Xin You Lei

Keyword(s):

Aqueous Solution ◽

Optimum Condition ◽

Visible Light ◽

Xenon Lamp ◽

Visible Light Region ◽

Dimethyl Phthalate ◽

Initial Concentration ◽

Light Region ◽

Degradation Rates ◽

Catalyst Dosage

The compound WO3/TiO2 nanostructures were prepared by the template technique and characterized by FE-SEM and UV-vis DRS. And they were used to degrade the dimethyl phthalate (DMP) under visible light irradiation. The effects of the initial concentration of DMP and dissolved oxygen (DO) were investigated. The results show that degradation rates reaches 59% in the optimum condition which is the catalyst dosage ~3cm2, the DO is 19.2 mg/ L, xenon lamp irradiating 300 minutes and the initial concentration of dimethyl phthalate in aqueous solution is 10 mg / L.

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Optimization of Tungsten Disulfide/Polypyrrole Composite as Photocatalyst in Sunlight-Asissted Photodegradation of Methylene Blue in Aqueous Solution

10.21203/rs.3.rs-731673/v1 ◽

2021 ◽

Author(s):

Siti Nor Atika Baharin ◽

Nurul Hafawati Hashim ◽

Izyan Najwa Mohd Norsham ◽

Syed Shahabuddin ◽

Kavirajaa Pandian Sambasevam

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Contact Time ◽

Oxidative Polymerization ◽

Effective Parameters ◽

X Ray Diffraction ◽

Sunlight Irradiation ◽

Initial Concentration ◽

Tungsten Disulphide ◽

Polypyrrole Composite

Abstract The present study highlights the sunlight-assisted photodegradation of methylene blue (MB) using tungsten disulphide/polypyrrole (WS2/PPy) composite as a photocatalyst. WS2/PPy was prepared via oxidative polymerization using ferric chloride (FeCl3) as an oxidant. Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM) measurement were used to ensure the physicochemical properties of WS2/PPy. The photocatalytic efficiencies of the photocatalysts were examined by degrading methylene blue (MB) under sunlight irradiation. The results showed that the degradation efficiency of WS2/PPy was higher than the pristine PPy Several optimizations such as effect of the concentration, contact time, photocatalyst dosage and initial concentration were investigated. The results revealed that, under optimum condition of pH 3, 100 mg photocatalyst dosage, 10 ppm MB initial concentration within 180 minutes contact time, were the most effective parameters, that produced 96.15% of sunlight-assisted photodegradation in aqueous solution of MB.

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Citric Acid Capped CdS Quantum Dots for Fluorescence Detection of Copper Ions (II) in Aqueous Solution

Nanomaterials ◽

10.3390/nano9010032 ◽

2018 ◽

Vol 9 (1) ◽

pp. 32 ◽

Cited By ~ 9

Author(s):

Zhezhe Wang ◽

Xuechun Xiao ◽

Tong Zou ◽

Yue Yang ◽

Xinxin Xing ◽

...

Keyword(s):

Aqueous Solution ◽

Quantum Dots ◽

Citric Acid ◽

Limit Of Detection ◽

Copper Ions ◽

High Sensitivity ◽

Fluorescence Sensor ◽

Cds Quantum Dots ◽

Detection Range ◽

Cds Qds

Citric acid capped CdS quantum dots (CA-CdS QDs), a new assembled fluorescent probe for copper ions (Cu2+), was synthesized successfully by a simple hydrothermal method. In this work, the fluorescence sensor for the detection of heavy and transition metal (HTM) ions has been extensively studied in aqueous solution. The results of the present study indicate that the obtained CA-CdS QDs could detect Cu2+ with high sensitivity and selectivity. It found that the existence of Cu2+ has a significant fluorescence quenching with a large red shifted (from greenish-yellow to yellowish-orange), but not in the presence of 17 other HTM ions. As a result, Cu2S, the energy level below the CdS conduction band, could be formed at the surface of the CA-CdS QDs and leads to the quenching of fluorescence of CA-CdS QDs. Under optimal conditions, the copper ions detection range using the synthesized fluorescence sensor was 1.0 × 10‒8 M to 5.0 × 10‒5 M and the limit of detection (LOD) is 9.2 × 10‒9 M. Besides, the as-synthesized CA-CdS QDs sensor exhibited good selectivity toward Cu2+ relative to other common metal ions. Thus, the CA-CdS QDs has potential applications for detecting Cu2+ in real water samples.

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